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Go JSON

Go has built-in support for JSON encoding and decoding. it also supports custom datatypes.

The Marshal function is used to convert go data types into JSON format.

Marshal function syntax is:

Marshal returns the JSON encoding of v.

Boolean is converted to JSON booleans. Floating point, integer, and Number are converted to JSON numbers. The map's key type must either be a string, an integer type, or implement encoding.TextMarshaler.

The decoding of JSON is done using Unmarshal function.

Unmarshal function syntax is:

Unmarshal decodes JSON-encoded value and stores the result in the value pointed to by v. If v is nil or not a pointer, Unmarshal returns an InvalidUnmarshalError.

We can also customize the fields stored under the "json" key in the struct field's tag. we can have name of the field, followed by a comma-separated list of options. Like

Go JSON Example 1

Output:

false
10
3.14
"JavaTpoint"
["sun","moon","star"]
{"moon":2,"sun":1}

Go JSON Example 2 (User Defined Data Type)

Output:

{"Position":1,"Planet":["mercury","venus","earth"]}
{"position":1,"planet":["mercury","venus","earth"]}
map[pi:6.13 place:[New York New Delhi]]
6.13
New York
{1 [mercury venus]}
venus
{"1":"mercury","2":"venus"}





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